#! /bin/sh
# Update the copyright dates in Emacs sources.
# Typical usage:
#
#	admin/update-copyright
#
# By default, this script uses the local-time calendar year.
# Set the UPDATE_COPYRIGHT_YEAR environment variable to override the default.

# Copyright 2013-2021 Free Software Foundation, Inc.

# This file is part of GNU Emacs.

# GNU Emacs is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# GNU Emacs is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

# written by Paul Eggert

# FIXME: The file 'notes/copyright' says that the AIST copyright years
# should be updated, but by inspection it appears that some should be
# updated and some should not be, due to registration numbers, so
# this script leaves these copyright years alone for now.

: ${UPDATE_COPYRIGHT_USE_INTERVALS=1}
export UPDATE_COPYRIGHT_USE_INTERVALS

: ${UPDATE_COPYRIGHT_YEAR=$(date +%Y)}
export UPDATE_COPYRIGHT_YEAR

emacsver=etc/refcards/emacsver.tex.in
sed 's/\\def\\year[{][0-9]*[}]/\\def\\year{'"$UPDATE_COPYRIGHT_YEAR"'}'/g \
  $emacsver >$emacsver.aux &&
{ cmp -s $emacsver $emacsver.aux ||
  cp $emacsver.aux $emacsver
} &&
rm $emacsver.aux &&

repo_files=$(git ls-files) &&

# Do not update the copyright of files that have one or more of the
# following problems:
# . They are license files, maintained by the FSF, with their own dates.
# . They are GMP files, maintained by the GMP project, with their own dates.
# . Their format cannot withstand changing the contents of copyright strings.

updatable_files=$(find $repo_files \
  ! -name COPYING \
  ! -name doclicense.texi \
  ! -name gpl.texi \
  ! -name '*-gzipped' \
  ! -name '*.ico' \
  ! -name '*.icns' \
  ! -name '*.pbm' \
  ! -name '*.pdf' \
  ! -name '*.png' \
  ! -name '*.sig' \
  ! -name '*.tar' \
  ! -name '*.tiff' \
  ! -name '*.xpm' \
  ! -name eterm-color \
  ! -name hand.cur \
  ! -name key.pub \
  ! -name key.sec \
  ! -name 'mini-gmp.[ch]' \
  -print) &&

build-aux/update-copyright $updatable_files
